Can you raise the fence? Four foot is low for a dog fence, IMO.

When we got the first dog last Dec., we put in a 6 foot fence; not to keep the dogs in (they are bichons) but to keep the coyotes OUT. Have to consider what is the purpose of the fence and then determine the height.

I am attaching a photo so you can see the type fence we used. I think this is something you could add at the top of a current fence (although I don't know what type fence you have now.) We bought the stuff at Home Depot, not too expensive. IT is green, plastic coated wire. (The cahin link fence along the back is not ours.) And Alphaskunk will STILL be able to see out to see who it is. Just one idea.